Description: Das Projekt "Die Reaktion CO2-bezogener Prozesse in Grasslandoekosystemen in einer Drei-Jahres-CO2-Anreicherungsfeldstudie" wird vom Umweltbundesamt gefördert und von Eidgenössische Technische Hochschule Zürich, Institut für Pflanzenwissenschaften durchgeführt. The rising atmospheric CO2 concentration generally increases the growth of C3 plants. The amount and the pattern of the plants response depend on the species or even on the genotypes, and on the growing conditions. Thus, the competitive ability of the plants in plant communities may change and as result alter their floristic composition. In this project the responses of serveral grassland species to increased CO2 are studied in the field. Three FACE (Free Air Carbon dioxide Enrichment) rings are used to increase CO2 on circular areas of 14 m diameter to 600 ppm. Three control areas of equal size at ambient CO2 concentration are included. One experiment is studing the CO2 related responses of the growth processes in the shoot and the root part of Lolium perenne L and Trifolium repens L growing in monocultures and in mixture. In addition to the two CO2 treatments high and low Nitrogen fertilizer treatments and cutting treatments with four and six cuts per year are included, respectively. In another experiment the genotypic variation of the growth response to increased CO2 is studied. The CO2 effects on the growth of a mixture of seven grassland species and the relative importance of CO2 related changes on root and shoot competition are studied in further experiments.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Atmosphärische CO2-Konzentration ? Klee ? Nährstoffhaushalt ? Stickstoffdünger ? Vegetationsdynamik ? Genotyp ? Zürich ? Kohlendioxidkonzentration ? Futterbau ? Morphologie ? Pflanzengesellschaft ? Trockensubstanz ? Bodenwasser ? Grünland ? Kohlendioxid ? Pflanzenwurzel ? Staude ? Bodenorganismen ? Monokultur ? Anreicherung ? Biomasse ? Produktion ? Altersabhängigkeit ? Pflanzenwachstum ? carbohydrate partitioning ? competition ? floristic composition ? free air carbon dioxide enrichment FACE ? leaf area ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1992-10-01 - 2002-09-30
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